USE OF TIMING AND SYNCHRONIZATION OF AN ORTHOGONAL FREQUENCY DIVISION MULTIPLEX IN COMBINED SATELLITE-TERRESTRIAL NETWORK

• US 20070197241A1
• Filed: 12/22/2006
• Published: 08/23/2007
• Est. Priority Date: 01/03/2006
• Status: Abandoned Application

• Current Assignee: Telcom Ventures LLC
• Original Assignee: Telcom Ventures LLC
• Inventors: Singh, Rajendra, Olexa, George
• Application Number:
  US11/615,412
• Publication Number:
  US 20070197241A1
• Time in Patent Office: Days
• US Class Current: 455/500
• CPC Class Codes: H04B 7/022 Site diversity; Macro-diversity using two or more spaced independent antennas H04B7/04
• CPC Class Codes: H04B 7/18584 Arrangements for data networking, i.e. for data packet routing, for congestion control data switching networks H04L12/00
• CPC Class Codes: H04B 7/18589 Arrangements for controlling an end to end session, i.e. for initialising, synchronising or terminating an end to end link
• CPC Class Codes: H04B 7/208 Frequency-division multiple access [FDMA]
• CPC Class Codes: H04L 27/2601 Multicarrier modulation systems
• CPC Class Codes: H04L 27/2626 Arrangements specific to the transmitter only
• CPC Class Codes: H04W 56/0085 detecting a given structure in the signal

Abstract

A system and a method of communicating a data signal in a network of geographically spread out transceivers including a plurality of transmitters. At least one of the transmitters is on a satellite. The plurality of transmitters communicate wirelessly with a receiver. Each of the plurality of transmitters transmits a copy of the data signal on a plurality of orthogonal sub-carrier frequencies to the receiver. The plurality of transmitters are synchronized so that the receiver receives the copies of the data signal substantially simultaneously.

Claims

1. A method of transmitting a data signal from a plurality of transmitters to a receiver, comprising:

operating each one of the plurality of transmitters to transmit a data signal on a plurality of orthogonal sub-carrier frequencies to the receiver, wherein at least one of the transmitters is on a satellite and the plurality of transmitters are geographically spread out, the receiver receiving an impaired copy of the data signal from at least one of the plurality of transmitters; and

synchronizing the plurality of transmitters so that the receiver receives impaired copies of the data substantially simultaneously, wherein the receiver employs the impaired copies of the data to reconstitute the data signal.

2. The method according to claim 1, wherein the receiver integrates the impaired copies of the data to reconstitute the data signal.

3. The method according to claim 1, wherein the synchronizing of the plurality of transmitters includes timing the transmitters relative to a time reference.

4. A method of transmitting a data signal from a transmitter to a plurality of receivers, comprising:

operating the transmitter to transmit a data signal on a plurality of orthogonal sub-carrier frequencies to the plurality of receivers, wherein at least one of the receivers is on a satellite and the plurality of receivers are geographically spread out, at least some of the receivers receiving an impaired copy of the data signal;

comparing the impaired copies of the data signal; and

combining the impaired copies of the data so as to reconstitute the data signal.

5. The method according to claim 4, further comprising buffering the impaired copies of the data signal.

6. The method according to claim 4, further comprising analyzing the impaired copies of the data signal.

7. The method according to claim 4, wherein the receivers receiving the impaired copy of the data signal are configured to rebuild a substantially error free copy of the data signal using the comparison between the impaired copies of the data signal.

8. A system for communicating data signals in a network of transceivers, comprising:

a receiver; and

a plurality of transmitters configured to communicate wirelessly with the receiver,

wherein at least one of the transmitters is on a satellite and the plurality of transmitters are geographically spread out,

wherein the plurality of transmitters are configured to transmit a data signal on a plurality of orthogonal sub-carrier frequencies to the receiver, the receiver receiving an impaired copy of the data signal from at least one of the plurality of transmitters,

wherein the plurality of transmitters are configured to be synchronized so that the receiver receives impaired copies of the data substantially simultaneously, and

wherein the receiver is further configured to employ the impaired copies of the data to reconstitute the data signal.

9. The system according to claim 8, wherein the receiver is further configured to integrate the impaired copies.

10. The system according to claim 8, wherein the plurality of transmitters are configured to be synchronized relative to a time reference.

11. A system for communicating data signals in a network of transceivers, comprising:

a plurality of receivers, wherein at least one of the receivers is on a satellite and the plurality of receivers are geographically spread out; and

a transmitter configured to communicate wirelessly with the plurality of receivers, the transmitter being configured to transmit a data signal on a plurality of orthogonal sub-carrier frequencies to the plurality of receivers, at least some of the receivers receiving an impaired copy of the data signal; and

a combination unit in communication with the plurality of receivers, the combination unit being configured to combine the impaired copies of the data so as to reconstitute the data signal.

12. The system according to claim 11, further comprising a buffering device in communication with the plurality of receivers, the buffering device being configured to buffer the impaired copies of the data signal.

13. The system according to claim 12, further comprising a comparing device in communication with the buffering device, the comparing device configured to compare the impaired copies of the data signal.

14. The method according to claim 13, wherein the receivers receiving the impaired copy of the data signal are configured to rebuild a substantially error free copy of the data signal using a result of the comparison between the impaired copies of the data signal output by the comparing device.

15. A network of transmitters, comprising:

a plurality transmitters configured to communicate wirelessly with a receiver,

wherein at least one of the transmitters is on a satellite and the plurality of transmitters are geographically spread out, and each of the plurality of transmitters is configured to transmit a copy of a data signal on a plurality of orthogonal sub-carrier frequencies to the receiver, and

wherein the plurality of transmitters are configured to be synchronized so that the receiver receives the copies of the data signal substantially simultaneously.

16. A network of receivers, comprising:

a plurality of receivers, wherein at least one of the receivers is on a satellite and the plurality of receivers are geographically spread out, and each receiver is configured to receive a copy of a data signal from a transmitter, the copy of the data signal being transmitted on a plurality of orthogonal sub-carrier frequencies; and

a combination unit in communication with the plurality of receivers, the combination unit being configured to combine the copies of the data signal received by the receivers.